Sperske alleges that he and the three remaining Haunted Graffiti members-- Pink (real name Ariel Rosenberg), Tim Koh, and Kenny Gilmore-- wrote the songs for the upcoming record Mature Themes together and that he's entitled to 25 percent ownership. He claims he's "entitled to profits from royalties and future shows," writes Entertainment Law Digest, and is seeking $1 million in punitive damages. (Cole M. Greif-Neill was originally part of the partnership as well, but "left the partnership of his own accord in 2010," according to Entertainment Law Digest.)

According to the lawsuit, which was filed on August 12 in Los Angeles, Sperske was removed from the band in spite of performing "diligently and competently." Read the entire lawsuit here.

Earlier this summer, breakup rumors surfaced surrounding the band, but were denied.

Mature Themes is scheduled for release on August 21 in the U.S. and August 20 in the UK via 4AD.